Color Scale Tool
"Take your color tooling to the next level with Geenes, which can help you figure out all the tints and shade of your palette.
Geenes empowers you to build out full tint/shade ranges for each color group you add, allowing you to design a full-color system you can export to Figma, Sketch or code. In addition to providing contrast ratios, Geenes also allows you to apply your palette to various mockups, and emulate different forms of color blindness.
The app is entirely built in Vue.js."